Direct gasification of dewatered sewage sludge in supercritical water. Part 1: Effects of alkali salts

Direct gasification of dewatered sewage sludge in supercritical water. Part 1: Effects of alkali salts
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脱水污泥在超临界水中直接气化。

DOI:
10.1016/j.ijhydene.2013.01.164
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发表时间:
2013-04
影响因子:
7.2
通讯作者:
Zhang, H. W.
Zhang, H. W.
中科院分区:
工程技术2区
文献类型:
--
作者:
Xu, Z. R.;Zhu, W.;Gong, M.;Zhang, H. W.

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本研究采用高压釜,在450℃恒温、停留时间30min的条件下,研究了碱金属盐[NaOH、KOH、K2CO3、Na2CO3和Ca(OH)2]对脱水污泥在超临界水中直接气化的催化效果。在碱金属盐(Ca(OH)2 除外)的存在下,氢产率增加。具体来说,随着 K2CO3 浓度从 0 wt% 增加到 8 wt%,氢气产率从 0.68 mol/(kg OM) 增加到 3.45 mol/(kg OM)。虽然Ca(OH)2对氢气产率的催化效果没有显着影响,但它确实影响了CO2产率。一般来说,碱金属盐的添加不会影响液体残留物中的有机物或总酚浓度。此外,脱水污泥的碱催化水解显着抑制了炭的形成[Ca(OH)2 的情况除外]。
In the present study, the catalytic effects of alkali salts [NaOH, KOH, K2CO3, Na2CO3and Ca(OH)2] on the direct gasification of dewatered sludge in supercritical water were investigated by using a high-pressure autoclave at a constant temperature of 450 °C and a residence time of 30 min. The hydrogen yield increased in the presence of the alkali salts, except for Ca(OH)2. Specifically, the hydrogen yield increased from 0.68 to 3.45 mol/(kg OM) as the K2CO3concentration increased from 0 to 8 wt%. Although Ca(OH)2did not significantly impact the catalytic effect on the hydrogen yield, it did impact the CO2yield. Generally, the addition of alkali salts did not affect the organic matter or total phenol concentrations in the liquid residue. Moreover, char formation was considerably suppressed by the alkaline catalyzed hydrolysis of the dewatered sludge [except in the case of Ca(OH)2].
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